package com.sky.aspect;


import com.sky.annotation.AutFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Slf4j
@Component
@Aspect
public class AutoFillAspect {
    /*
    * 切入点
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutFill)")
    public void autoFillPointCut(){}
    /*
    * 前置通知，在通知中进行公共字段赋值
    * */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint JoinPoint){
        log.info("开始进行公共字段自动填充");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature Signature = (MethodSignature) JoinPoint.getSignature();//方法签名对象
        AutFill autFill = Signature.getMethod().getAnnotation(AutFill.class);//获得方法上的注解对象
        OperationType operationType = autFill.value();//获取数据库操作类型


        //获取到当前被拦截的方法的参数
        Object entity = JoinPoint.getArgs()[0];
        if (entity==null){
            return;
        }
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //通过反射获取对象中的属性并赋值
        if (operationType== OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
               } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if (operationType== OperationType.UPDATE){
            try { Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
